Supersensitization of CdS quantum dots with a near-infrared organic dye: Toward the design of panchromatic hybrid-sensitized solar cells

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Abstract

The photoresponse of quantum dot solar cells (QDSCs) has been successfully extended to the near-IR (NIR) region by sensitizing nanostructured TiO 2-CdS films with a squaraine dye (JK-216). CdS nanoparticles anchored on mesoscopic TiO2 films obtained by successive ionic layer adsorption and reaction (SILAR) exhibit limited absorption below 500 nm with a net power conversion efficiency of ∼1% when employed as a photoanode in QDSC. By depositing a thin barrier layer of Al2O3, the TiO2-CdS films were further modified with a NIR absorbing squaraine dye. Quantum dot sensitized solar cells supersensitized with a squariand dye (JK-216) showed good stability during illumination with standard global AM 1.5 solar conditions, delivering a maximum overall power conversion efficiency () of 3.14%. Transient absorption and pulse radiolysis measurements provide further insight into the excited state interactions of squaraine dye with SiO 2, TiO2, and TiO2/CdS/Al2O 3 films and interfacial electron transfer processes. The synergy of combining semiconductor quantum dots and NIR absorbing dye provides new opportunities to harvest photons from different regions of the solar spectrum. © 2011 American Chemical Society.

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Choi, H., Nicolaescu, R., Paek, S., Ko, J., & Kamat, P. V. (2011). Supersensitization of CdS quantum dots with a near-infrared organic dye: Toward the design of panchromatic hybrid-sensitized solar cells. ACS Nano, 5(11), 9238–9245. https://doi.org/10.1021/nn2035022

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